1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.search.lucene;
24  
25  import com.liferay.portal.kernel.dao.orm.QueryUtil;
26  import com.liferay.portal.kernel.log.Log;
27  import com.liferay.portal.kernel.log.LogFactoryUtil;
28  import com.liferay.portal.kernel.search.Document;
29  import com.liferay.portal.kernel.search.DocumentImpl;
30  import com.liferay.portal.kernel.search.Field;
31  import com.liferay.portal.kernel.search.Hits;
32  import com.liferay.portal.kernel.search.HitsImpl;
33  import com.liferay.portal.kernel.search.IndexSearcher;
34  import com.liferay.portal.kernel.search.Query;
35  import com.liferay.portal.kernel.search.SearchException;
36  import com.liferay.portal.kernel.search.Sort;
37  import com.liferay.portal.kernel.util.Time;
38  
39  import java.io.IOException;
40  
41  import java.util.List;
42  
43  import org.apache.lucene.queryParser.ParseException;
44  import org.apache.lucene.search.BooleanQuery;
45  import org.apache.lucene.search.SortField;
46  
47  /**
48   * <a href="LuceneIndexSearcherImpl.java.html"><b><i>View Source</i></b></a>
49   *
50   * @author Bruno Farache
51   */
52  public class LuceneIndexSearcherImpl implements IndexSearcher {
53  
54      public Hits search(
55              long companyId, Query query, Sort[] sorts, int start, int end)
56          throws SearchException {
57  
58          if (_log.isDebugEnabled()) {
59              _log.debug("Query " + query);
60          }
61  
62          Hits hits = null;
63  
64          org.apache.lucene.search.IndexSearcher searcher = null;
65          org.apache.lucene.search.Sort luceneSort = null;
66  
67          try {
68              searcher = LuceneUtil.getSearcher(companyId);
69  
70              if (sorts != null) {
71                  SortField[] sortFields = new SortField[sorts.length];
72  
73                  for (int i = 0; i < sorts.length; i++) {
74                      Sort sort = sorts[i];
75  
76                      sortFields[i] = new SortField(
77                          sort.getFieldName(), sort.getType(), sort.isReverse());
78                  }
79  
80                  luceneSort = new org.apache.lucene.search.Sort(sortFields);
81              }
82  
83              org.apache.lucene.search.Hits luceneHits = searcher.search(
84                  QueryTranslator.translate(query), luceneSort);
85  
86              hits = subset(luceneHits, start, end);
87          }
88          catch (BooleanQuery.TooManyClauses tmc) {
89              int maxClauseCount = BooleanQuery.getMaxClauseCount();
90  
91              BooleanQuery.setMaxClauseCount(Integer.MAX_VALUE);
92  
93              try {
94                  org.apache.lucene.search.Hits luceneHits = searcher.search(
95                      QueryTranslator.translate(query), luceneSort);
96  
97                  hits = subset(luceneHits, start, end);
98              }
99              catch (Exception e) {
100                 throw new SearchException(e);
101             }
102             finally {
103                 BooleanQuery.setMaxClauseCount(maxClauseCount);
104             }
105         }
106         catch (ParseException pe) {
107             _log.error("Query: " + query, pe);
108 
109             return new HitsImpl();
110         }
111         catch (Exception e) {
112             throw new SearchException(e);
113         }
114         finally {
115             try {
116                 if (searcher != null) {
117                     searcher.close();
118                 }
119             }
120             catch (IOException ioe) {
121                 throw new SearchException(ioe);
122             }
123         }
124 
125         if (_log.isDebugEnabled()) {
126             _log.debug(
127                 "Search found " + hits.getLength() + " results in " +
128                     hits.getSearchTime() + "ms");
129         }
130 
131         return hits;
132     }
133 
134     protected DocumentImpl getDocument(
135         org.apache.lucene.document.Document oldDoc) {
136 
137         DocumentImpl newDoc = new DocumentImpl();
138 
139         List<org.apache.lucene.document.Field> oldFields = oldDoc.getFields();
140 
141         for (org.apache.lucene.document.Field oldField : oldFields) {
142             String[] values = oldDoc.getValues(oldField.name());
143 
144             if ((values != null) && (values.length > 1)) {
145                 Field newField = new Field(
146                     oldField.name(), values, oldField.isTokenized());
147 
148                 newDoc.add(newField);
149             }
150             else {
151                 Field newField = new Field(
152                     oldField.name(), oldField.stringValue(),
153                     oldField.isTokenized());
154 
155                 newDoc.add(newField);
156             }
157         }
158 
159         return newDoc;
160     }
161 
162     protected Hits subset(
163             org.apache.lucene.search.Hits luceneHits, int start, int end)
164         throws IOException {
165 
166         int length = luceneHits.length();
167 
168         if ((start == QueryUtil.ALL_POS) && (end == QueryUtil.ALL_POS)) {
169             start = 0;
170             end = length;
171         }
172 
173         long startTime = System.currentTimeMillis();
174 
175         Hits subset = new HitsImpl();
176 
177         if ((start > - 1) && (start <= end)) {
178             if (end > length) {
179                 end = length;
180             }
181 
182             int subsetTotal = end - start;
183 
184             Document[] subsetDocs = new DocumentImpl[subsetTotal];
185             float[] subsetScores = new float[subsetTotal];
186 
187             int j = 0;
188 
189             for (int i = start; i < end; i++, j++) {
190                 subsetDocs[j] = getDocument(luceneHits.doc(i));
191                 subsetScores[j] = luceneHits.score(i);
192             }
193 
194             subset.setLength(length);
195             subset.setDocs(subsetDocs);
196             subset.setScores(subsetScores);
197             subset.setStart(startTime);
198 
199             float searchTime =
200                 (float)(System.currentTimeMillis() - startTime) / Time.SECOND;
201 
202             subset.setSearchTime(searchTime);
203         }
204 
205         return subset;
206     }
207 
208     private static Log _log =
209         LogFactoryUtil.getLog(LuceneIndexSearcherImpl.class);
210 
211 }